A graphene quantum dot/phthalocyanine conjugate: a synergistic catalyst for the oxygen reduction reaction

Koh, Ki Hwan; Noh, Sung Hyun; Kim, Tae Hyun; Lee, Wonjun; Yi, Sung Chul; Han, Tae Hee

doi:10.1039/c6ra27873f

Cited by 39 publications

(19 citation statements)

References 37 publications

(50 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…GQDs have recently attracted high interest as alternatives to metal-based semiconductor QDs for numerous applications, like bio-imaging [17,18] and drug delivery [19,20], light-emitting diodes [21][22][23], optoelectronic devices [24,25], electrocatalysis [26,27], or biosensors [28][29][30], due to these unique optical properties, high chemical and photo-stability, low toxicity, low cost, and easy functionalization.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

et al. 2020

View full text Add to dashboard Cite

2,2’-(Ethylenedioxy)bis(ethylamine)-functionalized graphene quantum dots (GQDs) were prepared under mild conditions from graphene oxide (GO) via oxidative fragmentation. The as-prepared GQDs have an average diameter of ca. 4 nm, possess good colloidal stability, and emit strong green-yellow light with a photoluminescence (PL) quantum yield of 22% upon excitation at 375 nm. We also demonstrated that the GQDs exhibit high photostability and the PL intensity is poorly affected while tuning the pH from 1 to 8. Finally, GQDs can be used to chelate Fe(II) and Cu(II) cations, scavenge radicals, and reduce Fe(III) into Fe(II). These chelating and reducing properties that associate to the low cytotoxicity of GQDs show that these nanoparticles are of high interest as antioxidants for health applications.

show abstract

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

et al. 2020

View full text Add to dashboard Cite

show abstract

“…When smaller-sized graphene is applied, the number of active sites can be increased; however, the electrical conductivity of the conductive substrate can be deteriorated by a higher interfacial resistance originating from reduced grain size [54]. Although Koh et al reported a promising ORR composite catalyst using graphene quantum dots as a conductive supporter [53], more in-depth studies on controlling the size of graphene substrates are expected to be highly beneficial for moving the technology forward.…”

Section: Discussionmentioning

confidence: 99%

“…Koh et al prepared covalently functionalized graphene quantum dots (GQDs) with FePc using a simple ferric chloride reaction [53]. As illustrated in Figure 8Aa,b, the conjugation of GQDs with FePc in the composite was achieved by the formation of Fe-O-C bonds between them.…”

Section: Fe-o-c Linkage Between Fepc and Graphenementioning

confidence: 99%

See 1 more Smart Citation

Iron Phthalocyanine/Graphene Composites as Promising Electrocatalysts for the Oxygen Reduction Reaction

Park

Chang

2020

Energies

View full text Add to dashboard Cite

Recently, the development of non-precious electrocatalysts for the oxygen reduction reaction (ORR) has become important in replacing currently employed platinum (Pt)-based catalysts. Although Pt-based catalysts exhibit satisfactory ORR performances, their high price, easy methanol/CO2 poisoning, and poor long-term stability significantly hamper the forward movement of fuel cell technology. Among the various candidates, graphene-supported iron phthalocyanine (FePc) composites have attracted great attention because of their unique advantages, including low cost, good dimensional stability, high durability, and tunable catalytic activity. In the composite catalyst, FePc molecules are immobilized on graphene via noncovalent or covalent interactions. In addition, two-dimensional graphene substrates can improve not only the electrical conductivity of the composite, but also the dispersion of FePc molecules, triggering a significant improvement in the catalytic properties of the composite catalyst. Herein, we summarize the recent advances in FePc/graphene composite catalysts used for the ORR. Moreover, we discuss the challenges and future perspectives of this promising field.

show abstract

“…Non-noble metal based GQD catalysts also showed enhanced catalytic activity. Koh et al conjugated iron (II) phthalocyanine (FePC) with GQDs and used the catalyst for ORR in alkaline medium [72]. The catalyst also showed potential tolerance against methanol and carbon dioxide.…”

Section: Gqd Supported Metallic and Nonmetallic Nanoparticlesmentioning

confidence: 99%

Contribution of Carbon Dot Nanoparticles in Electrocatalysis: Development in Energy Conversion Process

Jana

Ngo

Chung

et al. 2020

J. Electrochem. Sci. Technol

View full text Add to dashboard Cite

Modern electrochemical energy devices involve generation and reduction of fuel gases through electrochemical reactions of water splitting, alcohol oxidation, oxygen reduction, etc. Initially, these processes were executed in the presence of noble metal-based catalyst that showed low overpotential and high current density. However, its high cost, unavailability, corrosion and related toxicity limited its application. The search for alternative with high stability, durability, and efficiency led scientists towards carbon nanoparticles supported catalysts which has high surface area, good electrical conductivity, tunable morphology, low cost, ease of synthesis and stability. Carbon nanoparticles are classified into two groups based on morphology, one and zero dimensional particles. Carbon nanoparticles at zero dimension, denoted as carbon dots, are less used carbon support compared to other forms. However, recently carbon dots with improved electronic properties have become popular as catalyst as well as catalyst support. This review focused on the recent advances in electrocatalytic activities of carbon dots. The mechanisms of common electrocatalytic reactions and the role of the catalysts are also discussed. The review also proposed future developments and other research directions to overcome current limitations.

show abstract

A graphene quantum dot/phthalocyanine conjugate: a synergistic catalyst for the oxygen reduction reaction

Abstract: In this work, a novel graphene quantum dot/iron phthalocyanine conjugate is synthesized. This hybrid material show efficient electrocatalytic activityviafour electron reaction and distinguished tolerance toward methanol and CO.

Cited by 39 publications

References 37 publications

One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

Iron Phthalocyanine/Graphene Composites as Promising Electrocatalysts for the Oxygen Reduction Reaction

Contribution of Carbon Dot Nanoparticles in Electrocatalysis: Development in Energy Conversion Process

Contact Info

Product

Resources

About